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Automatic reconfiguration of layer 3 device to layer 2 device upon detection of upstream NAT/NAPT device

  • US 8,619,765 B2
  • Filed: 06/13/2005
  • Issued: 12/31/2013
  • Est. Priority Date: 06/13/2005
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • in response to a powering up of a router including a STUN client, detecting whether there is NAT/NAPT service upstream to the router by comparing STUN messages from the STUN client and from a STUN server;

    if upstream NAT/NAPT service is detected, disabling a DHCP server, a NAT/NAPT facility, and a layer 3 forwarding service within the router, and enabling a layer 2 forwarding service within the router in a manner that causes the router to act as a layer 2 bridge between layer 2 network nodes coupled to a WAN port on the router and layer 2 network nodes coupled to a LAN port on the router.

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